C#-对称加密的一个例子

这个小程序,算不上什么.为了节省时间.请看代码!

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

using System.Security.Cryptography;

using System.IO;

namespace 对称加密应用

{

///

/// Form1 的摘要说明。

///

public class Form1 : System.Windows.Forms.Form

{

private System.Windows.Forms.TextBox textBox1;

private System.Windows.Forms.TextBox textBox2;

private System.Windows.Forms.Button button1;

private System.Windows.Forms.Button button2;

///

/// 必需的设计器变量。

private System.Windows.Forms.TextBox textBox3;

private System.Windows.Forms.OpenFileDialog openfile;

private System.Windows.Forms.Button button3;

private System.Windows.Forms.SaveFileDialog savefile;

private System.Windows.Forms.Button button4;

private System.Windows.Forms.Label label1;

private System.Windows.Forms.Label label2;

private System.Windows.Forms.CheckBox checkBox1;

//创建实例

RijndaelManaged rij = new RijndaelManaged();//

//全局变量，标记文件的扩展名

private static string ext=null;

//标记加密成功与否

private static bool enresult = false;

//标记解密成功与否的标记

private static bool deresult = false;

///

private System.ComponentModel.Container components = null;

public Form1()

{

//

// Windows 窗体设计器支持所必需的

//

InitializeComponent();

//

// TODO: 在 InitializeComponent 调用后添加任何构造函数代码

//

}

///

/// 清理所有正在使用的资源。

///

protected override void Dispose( bool disposing )

{

if( disposing )

{

if (components != null)

{

components.Dispose();

}

}

base.Dispose( disposing );

}

#region Windows 窗体设计器生成的代码

///

/// 设计器支持所需的方法 - 不要使用代码编辑器修改

/// 此方法的内容。

///

private void InitializeComponent()

{

this.textBox1 = new System.Windows.Forms.TextBox();

this.textBox2 = new System.Windows.Forms.TextBox();

this.button1 = new System.Windows.Forms.Button();

this.button2 = new System.Windows.Forms.Button();

this.textBox3 = new System.Windows.Forms.TextBox();

this.openfile = new System.Windows.Forms.OpenFileDialog();

this.button3 = new System.Windows.Forms.Button();

this.savefile = new System.Windows.Forms.SaveFileDialog();

this.button4 = new System.Windows.Forms.Button();

this.label1 = new System.Windows.Forms.Label();

this.label2 = new System.Windows.Forms.Label();

this.checkBox1 = new System.Windows.Forms.CheckBox();

this.SuspendLayout();

//

// textBox1

//

this.textBox1.Location = new System.Drawing.Point(88, 96);

this.textBox1.Name = "textBox1";

this.textBox1.Size = new System.Drawing.Size(168, 21);

this.textBox1.TabIndex = 0;

this.textBox1.Text = "";

//

// textBox2

//

this.textBox2.Location = new System.Drawing.Point(88, 136);

this.textBox2.Name = "textBox2";

this.textBox2.Size = new System.Drawing.Size(168, 21);

this.textBox2.TabIndex = 1;

this.textBox2.Text = "";

//

// button1

//

this.button1.Location = new System.Drawing.Point(88, 200);

this.button1.Name = "button1";

this.button1.TabIndex = 2;

this.button1.Text = "加密";

this.button1.Click += new System.EventHandler(this.button1_Click);

//

// button2

//

this.button2.Location = new System.Drawing.Point(192, 200);

this.button2.Name = "button2";

this.button2.TabIndex = 3;

this.button2.Text = "解密";

this.button2.Click += new System.EventHandler(this.button2_Click);

//

// textBox3

//

this.textBox3.HideSelection = false;

this.textBox3.Location = new System.Drawing.Point(88, 48);

this.textBox3.MaxLength = 17;

this.textBox3.Name = "textBox3";

this.textBox3.PasswordChar = '$';

this.textBox3.TabIndex = 4;

this.textBox3.Text = "";

this.textBox3.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;

//

// button3

//

this.button3.Location = new System.Drawing.Point(280, 96);

this.button3.Name = "button3";

this.button3.Size = new System.Drawing.Size(40, 23);

this.button3.TabIndex = 5;

this.button3.Text = "Open";

this.button3.Click += new System.EventHandler(this.button3_Click);

//

// button4

//

this.button4.Location = new System.Drawing.Point(280, 136);

this.button4.Name = "button4";

this.button4.Size = new System.Drawing.Size(40, 23);

this.button4.TabIndex = 6;

this.button4.Text = "Save";

this.button4.Click += new System.EventHandler(this.button4_Click);

//

// label1

//

this.label1.Location = new System.Drawing.Point(88, 24);

this.label1.Name = "label1";

this.label1.Size = new System.Drawing.Size(136, 23);

this.label1.TabIndex = 7;

this.label1.Text = "请输入你的密码：";

//

// label2

//

this.label2.Location = new System.Drawing.Point(216, 48);

this.label2.Name = "label2";

this.label2.Size = new System.Drawing.Size(184, 23);

this.label2.TabIndex = 8;

this.label2.Text = "（密码大小8至16个字符）";

//

// checkBox1

//

this.checkBox1.Location = new System.Drawing.Point(88, 168);

this.checkBox1.Name = "checkBox1";

this.checkBox1.Size = new System.Drawing.Size(216, 24);

this.checkBox1.TabIndex = 9;

this.checkBox1.Text = "删除源文件";

//

// Form1

//

this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);

this.ClientSize = new System.Drawing.Size(456, 278);

this.Controls.Add(this.checkBox1);

this.Controls.Add(this.label2);

this.Controls.Add(this.label1);

this.Controls.Add(this.button4);

this.Controls.Add(this.button3);

this.Controls.Add(this.textBox3);

this.Controls.Add(this.button2);

this.Controls.Add(this.button1);

this.Controls.Add(this.textBox2);

this.Controls.Add(this.textBox1);

this.Name = "Form1";

this.Text = "Form1";

this.ResumeLayout(false);

}

#endregion

///

/// 应用程序的主入口点。

///

[STAThread]

static void Main()

{

Application.Run(new Form1());

}

//加密文件的按钮

private void button1_Click(object sender, System.EventArgs e)

{

if(textBox1.Text != null || textBox2.Text != null)

encryption(textBox3.Text,textBox1.Text,textBox2.Text);

if(checkBox1.Checked==true && enresult==true)

DeleteFile(textBox1.Text);

}

//用于加密的函数

public void encryption(string textBox,string readfile,string writefile)

{

try

{

if(textBox.Length >=8 && textBox.Length<=16 )//判断密码的字符的大小

{

byte [] key = System.Text.Encoding.Default.GetBytes( textBox );

byte [] iv = rij.IV;

Rijndael crypt = Rijndael.Create();

ICryptoTransform transform = crypt.CreateEncryptor(key ,iv);

//写进文件

FileStream fswrite = new FileStream(writefile,FileMode.Create);

CryptoStream cs = new CryptoStream( fswrite ,transform ,CryptoStreamMode.Write );

//打开文件

FileStream fsread = new FileStream(readfile,FileMode.Open);

int length;

while((length = fsread.ReadByte() )!= -1)

cs.WriteByte((byte)length);

fsread.Close();

cs.Close();

fswrite.Close();

enresult = true ;//成功加密

MessageBox.Show("已经成功完成加密任务！");

}

else

{

MessageBox.Show("密码的最小长度为8个字符，最大长度为16个字符！");

return ;

}

}

catch (Exception e)

{

MessageBox.Show(e.ToString());

}

}

//用于解密的函数

public void decryption(string textBox,string readfile,string writefile)

{

try

{

if(textBox.Length >=8 && textBox.Length<=16 )

{

byte [] key = System.Text.Encoding.Default.GetBytes( textBox );

byte [] iv = rij.IV;

Rijndael crypt = Rijndael.Create();

ICryptoTransform transform = crypt.CreateDecryptor(key,iv);

//读取加密后的文件

FileStream fsopen = new FileStream(readfile,FileMode.Open);

CryptoStream cs = new CryptoStream( fsopen ,transform ,CryptoStreamMode.Read );

//把解密后的结果写进文件

FileStream fswrite = new FileStream(writefile,FileMode.OpenOrCreate);

int length;

while ((length = cs.ReadByte()) != -1)

fswrite.WriteByte((byte)length);

fswrite.Close();

cs.Close();

fsopen.Close();

deresult=true; //成功解密

MessageBox.Show("已经成功完成解密任务！");

}

else

{

MessageBox.Show("密码的最小长度为8个字符，最大长度为16个字符！");

return ;

}

}

catch (Exception e)

{

MessageBox.Show(e.ToString());

}

}

//解密文件

private void button2_Click(object sender, System.EventArgs e)

{

decryption( textBox3.Text,textBox1.Text,textBox2.Text ) ;

if(checkBox1.Checked==true && deresult==true)

DeleteFile(textBox1.Text);

}

//用于打开文件的按钮

private void button3_Click(object sender, System.EventArgs e)

{

openfile = new OpenFileDialog();openfile.Filter ="All files (*.*)|*.*" ;

openfile.ShowDialog();

textBox1.Text = openfile.FileName;

ext = getfileext(openfile.FileName);

}

private void button4_Click(object sender, System.EventArgs e)

{

savefile = new SaveFileDialog();

savefile.Filter =ext + " files" +"(*."+ext+")|*."+ ext +"|All files (*.*)|*.*" ;

savefile.ShowDialog();

textBox2.Text = savefile.FileName;

}

//得到文件的扩展名

private string getfileext(string filename)

{

try

{

char [] point = new char[] {'.'};

string [] filename2 = filename.Split(point);

return filename2[1];

}

catch

{

return null;

}

}

//删除文件的函数

public void DeleteFile(string filename)

{

try

{

File.Delete(filename);

}

catch (Exception e)

{

MessageBox.Show(e.ToString());

}

}

}

}

• ·3种减肥食物 瘦腰最有效 减肥_美丽顾问
• ·7款山楂健康减肥食谱 一月轻松瘦10斤 减肥_
• ·骨汤补身又减肥 李嘉欣绝密减肥食谱神奇曝光 减
• ·基于嵌入式系统的入侵检测及权限管理系统
• ·有氧运动爬楼梯 10种身边的神奇减肥运动 减肥
• ·一个产生精确的ADO连接字符串的小工具
• ·一些有趣的unix csh/sh命令
• ·FeedDemon获共享软件年度大奖
• ·Oracle数据库几种关闭方式
• ·批处理JDBC语句以提高处理速度